Apex domains cannot have CNAME records.
Question and response
Question
dig toufu-yashiro.com. NS
Answer
toufu-yashiro.com. 5 NS ns-1951.awsdns-51.co.uk.
toufu-yashiro.com. 5 NS ns-92.awsdns-11.com.
toufu-yashiro.com. 5 NS ns-1068.awsdns-05.org.
toufu-yashiro.com. 5 NS ns-1417.awsdns-49.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0